公开(公告)号：US20220228978A1

公开(公告)日：2022-07-21

申请号：US17614123

申请日：2020-05-14

Applicant: TOPPAN INC.

Inventor： Haruna KADOYA ,  Shigeki KUDO ,  Kenji OGAWARA

IPC: G01N21/3563 ,  C08J7/00 ,  B65D65/40 ,  B65B51/10 ,  B32B27/36

Abstract: The present disclosure relates to a method for selecting a polyester film in which the polyester film is used as a sealant layer in a multilayer body including a base material layer including a crystalline polyester film, an adhesive layer and a sealant layer in this order, the method including:
a step in which FT-IR analysis is performed on the polyester film by a reflection method, and the crystallinity of the polyester film is measured by the following formula; and
a step in which a first polyester film having a crystallinity of 2 to 15% is selected: I1409=p1×I1340+p2×I1370  (Formula 1) Crystallinity[%]=p1×(I1340/I1409)×100  (Formula 2)